Peridot, birthstone for August.  These are beautiful vibrant clean gemstones.  All of these rings are designed on a "flip" band (think cigar band withe a flat side which is worn to the center of the hand) Except of A which is on a saddle band.  Peridot are graded as to clarity and color, and like diamonds the bigger they are the more expensive.  A) 10carats set in silver, 1"long x 7/8"wide; B) 7carats 1"long x 3/4"wide halo around stone 14karat gold; C) 1/2"x 1/2"; D) 3/8" x 3/8"; E) all silver 3/8" x3/8";